1211221451120 has 20 divisors (see below), whose sum is σ = 2816089874040. Its totient is φ = 484488580416.

The previous prime is 1211221451119. The next prime is 1211221451123. The reversal of 1211221451120 is 211541221121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221451123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7570133990 + ... + 7570134149.

It is an arithmetic number, because the mean of its divisors is an integer number (140804493702).

Almost surely, 2^{1211221451120} is an apocalyptic number.

1211221451120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211221451120 is an abundant number, since it is smaller than the sum of its proper divisors (1604868422920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211221451120 is a wasteful number, since it uses less digits than its factorization.

1211221451120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15140268152 (or 15140268146 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 1211221451120 its reverse (211541221121), we get a palindrome (1422762672241).

The spelling of 1211221451120 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, four hundred fifty-one thousand, one hundred twenty".